How do I pull invoices from Facebook?

Log into Facebook Business Manager and open the Ads Manager. Once there, open the hamburger menu on the top left-hand side, highlight over All Tools to open all options and select Billingin the fifth column:

Once in Billing, select your date range from the drop down, click on Update and then Download All Invoices:

After clicking on Download All Invoices, you will have the option to get a summary version or individual invoices. If you are looking for a summary of what was charged broken down by transaction ID, choose the first option, if you want it broken down by campaign, choose the second.